<template>
	 <div>
	 	 <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
	 	 	<div class="iconfont header-abs-back">&#xe624;</div>
	 	 </router-link>
	 	 <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
	 	 	 <router-link to="/">
	 	 	 	 <div class="iconfont header-fixed-back">&#xe624;</div>
	 	 	 </router-link>	
	 	 	 景点详情
	 	 </div>
	 </div>
</template>


<script>
export default {
	name: 'DetailHeader',
	data () {
		return {
			showAbs: true,
			opacityStyle: {
				opacity: 0
			}
		}
	},
	methods: {
		handleScroll () {
			const top = document.documentElement.scrollTop
			if (top > 60) {
				let opacity = top / 140
				opacity = opacity > 1 ? 1 : opacity
                this.opacityStyle = {
                	opacity
                }
				this.showAbs = false
			}else {
				this.showAbs = true
			}
		}
	},
	activated () {
		window.addEventListener('scroll',this.handleScroll)
	},
	deactivated () {
		window.removeEventListener('scroll',this.handleScroll)
	}
	
}
</script>


<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
	.header-abs
	    position: absolute
	    left: .2rem
	    top: .2rem
	    width: .8rem
	    height: .8rem
	    line-height: .8rem
	    border-radius: .4rem
	    text-align: center
	    background: rgba(0,0,0,.8)
	    .header-abs-back
	        color: #fff
	        font-size: .4rem
	.header-fixed
	    z-index: 2
	    position: fixed
	    top: 0
	    left: 0
	    right: 0
	    height: $headerHeight
	    line-height: $headerHeight
	    text-align: center
	    color: #fff
	    background: $bgColor
	    font-size: .32rem
	    .header-fixed-back
	        position: absolute
	        top: 0
	        left: 0
	        width: .64rem
	        text-align: center
	        font-size: .4rem
	        color: #fff
</style>